865780461 has 96 divisors (see below), whose sum is σ = 1631750400. Its totient is φ = 449608320.

The previous prime is 865780459. The next prime is 865780537. The reversal of 865780461 is 164087568.

It is a happy number.

It is not a de Polignac number, because 865780461 - 2¹ = 865780459 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865780451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1220775 + ... + 1221483.

It is an arithmetic number, because the mean of its divisors is an integer number (16997400).

Almost surely, 2^865780461 is an apocalyptic number.

It is an amenable number.

865780461 is a deficient number, since it is larger than the sum of its proper divisors (765969939).

865780461 is a wasteful number, since it uses less digits than its factorization.

865780461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 865780461 is about 29424.1475832351. The cubic root of 865780461 is about 953.0944197172.

The spelling of 865780461 in words is "eight hundred sixty-five million, seven hundred eighty thousand, four hundred sixty-one".